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Then try to start car and see if it still happens. If it doesn't then likely a faulty battery. Try to determine if it does it even after coming in off highway and with the battery freshly having been charged right up by the alternator. It also could be a bad connection to the battery.

But it could be something else altogether, but this is a good place for you to start. Let us know.

Keep in mind that it isn't necessarily the battery, but a bad connection from the battery somewhere could also do this. If other cars are doing it, and they find it is not computer related somehow, they might discover that x number of cars built at such and such a time on such and such a shift, weren't getting battery cables torqued properly. It could be anything tho, but this is just a place to start. Where you can get a hand on, see if the battery connections and assorted sub plastic connector parts near battery are tight.

I'm planning to purchase a Sonata Turbo 2011,hearing alot of problems with Passenger seats and pulling to left.Is the Elantra better at this and is this good on the road.I know it does not have the speed the sonata has but is this quick enough?